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Chinese Physics B 2018年第7期27卷 50-65页

作者： Hao Teng Xin-Kui He Kun Zhao zhi-yi wei Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Science University of Chinese Academy of SciencesBeijing 100049China

The attosecond laser station （ALS） at the Synergetic Extreme Condition User Facility （SECUF） is a sophisticated and user-friendly platform for the investigation of the electron dynamics in atoms, molecules, and condensed matter on timescales ranging from tens of femtoseconds to tens of attoseconds. Short and tunable coherent extreme-ultraviolet （XUV） light sources based on high-order harmonic generation in atomic gases are being developed to drive a variety of endstations for inspecting and controlling ultrafast electron dynamics in real time. The combination of such light sources and end-stations offers a route to investigate fundamental physical processes in atoms, molecules, and condensed matter. The ALS consists of four beamlines, each containing a light source designed specifically for application experiments that will be performed in its own end-station. The first beamline will produce broadband XUV light for attosecond photoelectron spectroscopy and attosecond transient absorption spectroscopy. It is also capable of performing attosecond streaking to characterize isolated attosecond pulses and will allow studies on the electron dynamics in atoms, moleculars, and condensed matter. The second XUV beamline will produce narrowband femtoseeond XUV pulses for time-resolved and angle-resolved photoelectron spectroscopy, to study the electronic dynamics on the timescale of fundamental correlations and interactions in solids, especially in superconductors and topological insulators. The third beamline will produce broadband XUV pulses for attosecond coincidence spectroscopy in a cold-target recoil-ion momentum spectrometer, to study the ultrafast dynamics and reactions in atomic and molecular systems. The last beamline produces broadband attosecond XUV pulses designed for time-resolved photoemission electron microscopy, to study the ultrafast dynamics of plasmons in nanostructures and the surfaces of solid materials with high temporal and spatial resolutions simultane

关键词： attosecond extreme-ultraviolet (XUV) pulse pump-probe photoemission spectroscopy

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Refractive index sensor based on high-order surface plasmon resonance in gold nanofilm coated photonic crystal fiber

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Chinese Physics B 2019年第9期28卷 212-219页

作者： Zhen-Kai Fan Shao-Bo Fang Shu-Guang Li zhi-yi wei School of Information Science and Engineering Hebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory of Microstructural Material Physics of Hebei ProvinceSchool of ScienceYanshan UniversityQinhuangdao 066004China Institute of Physics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

We propose a novel kind of wide-range refractive index optical sensor based on photonic crystal fiber(PCF) covered with nano-ring gold *** refractive index sensing performance of the PCF sensor is analyzed and simulated by the finite element method(FEM).The refractive index liquid is infiltrated into the cladding air hole of the *** comparing the sensing performance of two kinds of photonic crystal fiber structures, a wide range and high sensitivity structure is *** surface plasmon resonance(SPR) excitation material is chose as gold, and large gold nanorings are embedded around the first cladding air hole of the *** higher order surface plasmon modes are generated in this designed optical fiber *** resonance coupling between the fundamental mode and the 5 th order surface plasmon polariton(SPP)modes is excited when the phase matching condition is ***, the 3 rd loss peaks appear obvious red-shift with the increase of the analyte refractive index, which shows a remarkable polynomial fitting *** fitnesses of two structures are 0.99 and 0.98, *** the range of refractive indices is from 1.40 to 1.43, the two kinds of sensors have high linear sensitivities of 1604 nm/RIU and 3978 nm/RIU, respectively.

关键词： surface plasmon resonance photonic crystal fiber sensor

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Structure and Biological Activities of Novel Triazole Compounds Containing 1,3,4-Oxadiazole Ring

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Chemical Research in Chinese Universities 2008年第3期24卷 299-302页

作者： XU Liang-zhong BI Wen-zhao SHANG Yu-qing ZHAI zhi-wei yi Xu College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao 266042 P R. China

Eighteen novel triazole compounds containing 1,3,4-oxadiazole groups were synthesized from 2-（1H-1,2,4-triazol-1-yl）acetohydrazide and carbon disulfide by several step reactions. The target compounds were characterized by elemental analysis, 1H NMR, 13C NMR, IR, MS, and X-ray crystallography. The results of preliminary biological tests show that all the compounds exhibit certain fungicidal activities.

关键词： 1H-1,2,4-Triazole 1,3,4-Oxadiazole Biological activity Crystal structure

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Variation of electron density in spectral broadening process in solid thin plates at 400 nm

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Chinese Physics B 2021年第10期30卷 323-327页

作者： Si-Yuan Xu yi-Tan Gao Xiao-Xian Zhu Kun Zhao Jiang-Feng Zhu zhi-yi wei School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Material Laboratory Dongguan 523808China

The generation of continuous spectrum centered at 400 nm from solid thin plates is demonstrated in this work.A continuum covering 365 nm to 445 nm is obtained when 125-µJ frequency-doubled Ti:sapphire laser pulses are applied to six thin fused silica plates at 1-kHz repetition *** generalized nonlinear Schrodinger equation simplified for forward propagation is solved numerically,the spectral broadening with the experimental parameters is simulated,and good agreement between simulated result and experimental measurement is *** variation of electron density in the thin plate and the advantage of a low electron density in the spectral broadening process are discussed.

关键词： nonlinear spectral broadening time-dependent nonlinear Schrodinger equation self-phase modu-lation electron density

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MoS_2 saturable absorber prepared by chemical vapor deposition method for nonlinear control in Q-switching fiber laser

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Chinese Physics B 2018年第8期27卷 7-12页

作者： Meng-Li Liu Yu-yi OuYang Huan-Ran Hou Ming Lei Wen-Jun Liu zhi-yi wei State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

Due to the remarkable carrier mobility and nonlinear characteristic, MoS2 is considered to be a powerful competitor as an effective optical modulated material in fiber lasers. In this paper, the MoS2 films are prepared by the chemical vapor deposition method to guarantee the high quality of the crystal lattice and uniform thickness. The transfer of the films to microfiber and the operation of gold plated films ensure there is no heat-resistant damage and anti-oxidation. The modulation depth of the prepared integrated microfiber-MoS2 saturable absorber is 11.07%. When the microfiber-MoS2 saturable absorber is used as a light modulator in the Q-switching fiber laser, the stable pulse train with a pulse duration of 888 ns at 1530.9 nm is obtained. The ultimate output power and pulse energy of output pulses are 18.8 mW and 88 nJ, respectively. The signal-to-noise ratio up to 60 dB indicates the good stability of the laser. This work demonstrates that the MoS2 saturable absorber prepared by the chemical vapor deposition method can serve as an effective nonlinear control device for the Q-switching fiber laser.

关键词： nonlinear optical materials fiber laser Q-switching

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A Self-Diffraction Temporal Filter for Contrast Enhancement in Femtosecond Ultra-High Intensity Laser

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Chinese Physics Letters 2021年第7期38卷 40-44页

作者： Xian-zhi Wang Zhao-Hua Wang Yuan-Yuan Wang Xu Zhang Jia-Jun Song zhi-yi wei Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China

We demonstrated a nonlinear temporal filter based on the self-diffraction(SD)*** contrast enhancement,angular dispersion and spectrum broadening properties of the SD process are investigated in experiment and *** by spectral phase well compensated laser pulses with bandwidth of 28 nm,the filter produced clean pulses with a temporal contrast higher than 10^(10) and excellent spatial profile,the spectrum of which was smoothed and broadened to 64 *** implementing this filter into a home-made 30 TW Ti:sapphire amplifier,temporal contrast of the amplified pulses was enhanced to 10^(10) within the time scale of−400 ps.

关键词： amplifier Femto filter

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Broadband mid-infrared pulse via intra-pulse difference frequency generation based on supercontinuum from multiple thin plates

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Chinese Physics B 2019年第11期28卷 168-172页

作者： Hang-Dong Huang Chen-Yang Hu Hui-Jun He Hao Teng zhi-Yuan Li Kun Zhao zhi-yi wei School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China College of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China

We report on the generation of optical pulses with a nearly one octave-spanning spectrum ranging from 1300 nm to2500 nm at 1 kHz repetition rate, which are based on intra-pulse difference frequency generation(DFG) in β-barium borate crystal(β-BBO) and passively carrier-envelope-phase(CEP) stabilized. The DFG is induced by few-cycle pulses initiated from spectral broadening in multiple thin plates driven by a Ti: sapphire chirped-pulse amplifier. Furthermore, a numerical simulation is developed to estimate the conversion efficiency and output spectrum of the DFG. Our results show that the pulses from the DFG have the potential for seeding intense mid-infrared(MIR) laser generation and amplification to study strong-field physics and attosecond science.

关键词： infrared pulses difference frequency generation ultrafast laser

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Spectral-Phase-Modulated Cross-Polarized Wave for Chirped Pulse Amplifier with High Contrast Ratio

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Chinese Physics Letters 2017年第2期34卷 43-46页

作者： Shuang Qin Zhao-Hua Wang Shuai-Shuai Yang Zhong-wei Shen Quan-Li Dong zhi-yi wei Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 School of Physics and Optoelectronic Engineering Ludong University Yantai 264025

We demonstrate a high-quality cross-polarized-wave filter based on spectral phase modulation. Driven by Well- eompressed spectral-phase fully-compensated fundamental laser lmlses, the filter stretches the pulse bandwi... 详细信息

关键词： Spectral-Phase-Modulated Cross-Polarized Wave for Chirped Pulse Amplifier with High Contrast Ratio FTL

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Properties of long light filaments in natural environment

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Chinese Physics B 2018年第8期27卷 364-367页

作者： Shi-You Chen Hao Teng Xin Lu Zong-wei Shen Shuang Qin Wen-Shou wei Rong-yi Chen Li-Ming Chen Yu-Tong Li zhi-yi wei Beijing National Laboratory lbr Condensed Matter Physics Institute of Physics.Chinese Academy of Sciences.Be（jing 100190China School of Physical Sciences University of Chinese Academy of Sicenccs.Be（ring 100049.China Institute of Desert Meteorology.China Meteorological Administration l_h＇umqi 830002China IFSA Collabon~tive lnnowltion Center Shanghai.liao Tong UniversityShanghai 200240China School of Instrumentation Science and Optoelectronics Engineering Beijing hTt＇ormation Science ＆ Technology Univer.sityBeijing 100192.China

The multiple filamentation of terawatt femtosecond （fs） laser pulses is experimentally studied in a natural environment. A more than 30-m long plasma filament with a millimeter diameter is formed by the collimated fs laser pulse freely propagating in an open atmosphere. This study provides the first quantitative experimental data about the electron density of a long range light filament in the atmosphere. The electron density of such a filament is quantitatively detected by using an electric method, showing that it is at the 1011-cm -3 level.

关键词： laser-plasma interactions filamentation propagation

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Universality of the Dynamic Characteristic Relationship of Electron Correlation in the Two-Photon Double Ionization Process of a Helium-Like System

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Chinese Physics Letters 2020年第11期37卷 27-32页

作者： Fei Li Yu-Jun Yang Jing Chen Xiao-Jun Liu zhi-yi wei Bing-Bing Wang Laboratory of Optical Physics Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Institute of Applied Physics and Computational Mathematics Beijing 100088China HEDPS Center for Applied Physics and TechnologyPeking UniversityBeijing 100084China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Universality of the dynamic characteristic relationship between the characteristic time tc and the two-electron Coulomb interaction energy V12 of the ground state in the two-photon double ionization process is investigated via changing the parameters of the two-electron atomic system and the corresponding laser *** numerical results show that the product tcV12 keeps constant around 4.1 in the cases of changing the nucleus charge,the electron charge,the electron mass,and changing simultaneously the nucleus charge and the electron *** results demonstrate that the dynamic characteristic relationship in the two-photon double ionization process is *** work sheds more light on the dynamic characteristic relationship in ultrafast processes and may find its application in measurements of attosecond pulses.

关键词： conditions. charge characteristic

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